Answer:
0.147 J
Explanation:
The total energy that has been transformed into thermal energy is equal to the loss of gravitational potential energy between the initial situation (bob at h=0.5 m above the ground) and the final situation (bob back but at h=0.45 m above the ground).
Therefore, we have
[tex]E_{thermal}=\Delta U=mgh_1 - mgh_2 = mg(h_1 -h_2)[/tex]
where
m = 0.3 kg is the mass of the bob
g = 9.8 m/s^2
h1 = 0.5 m is the initial height
h2 = 0.45 m is the final height
Substituting, we find the thermal energy
[tex]E_{thermal}=(0.3 kg)(9.8 m/s^2)(0.5 m-0.45 m)=0.147 J[/tex]
Therefore, the energy transformed into thermal energy is 0.147 J.
The Law of conservation of energy states energy can not be created nor be destroyed can transfer from one to another form. 0.147 joules of energy were transformed into thermal energy.
According to the Law of conservation of energy . Energy can not be created nor be destroyed it can transfer from one to another form.
The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.
In the above problem the total energy gets converted into thermal energy in expense of loss of gravitational potential energy between the two positions.
The given data in the problem will be;
h is the height of the bob
m is the mass of the bob = 0.3 kg
g is the gravitational acceleration = 9.8 m/s^2
h₁ is the initial height = 0.5 m
h₂ is the final height= 0.45 m
The value of thermal energy will be;
[tex]\rm E_ {thermal }= \triangle U \\\\ \triangle U=mgh_1 -mgh_2 \\\\ \triangle U=mg(h_1 -h_2)\\\\ \triangle U=0.3 \times 9.81 (0.5-0.45)\\\\ \triangle U=0.147 J[/tex]
Hence 0.147 joules of energy were transformed into thermal energy.
To learn more about the law of conservation of energy refer to the link;
https://brainly.com/question/2137260
